综合后电路与前仿波形不一致的情况，请大家进来分析分析！

prototyping · 发表于 2013-12-23 09:46:12

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本帖最后由 prototyping 于 2013-12-23 09:48 编辑

小弟最近写一个模块的时序，遇到了综合后电路与前仿波形不一致的情况，大概如下：代码是：

always@(WRITE_Counter[10:7])
case(WRITE_Counter[10:7])
4'b0000: Write_Comm<={Ram0_Data,Ram0_Addr};
4'b0001: Write_Comm<={Ram1_Data,Ram1_Addr};
4'b0010: Write_Comm<={Ram2_Data,Ram2_Addr};
4'b0011: Write_Comm<={Ram3_Data,Ram3_Addr};
4'b0100: Write_Comm<={Ram4_Data,Ram4_Addr};
4'b0101: Write_Comm<={Ram5_Data,Ram5_Addr};
4'b0110: Write_Comm<={Ram6_Data,Ram6_Addr};
4'b0111: Write_Comm<={Ram7_Data,Ram7_Addr};
// 4'b1000: Write_Comm<={Status_Data,Status_Addr};
default:Write_Comm<=32'h0000_0000;
endcase
always@(WRITE_Counter[6:1])
case(WRITE_Counter[6:1])
6'b000_000:Write_Seri<=Write_Comm[0];
6'b000_001:Write_Seri<=Write_Comm[1];
6'b000_010:Write_Seri<=Write_Comm[2];
6'b000_011:Write_Seri<=Write_Comm[3];
6'b000_100:Write_Seri<=Write_Comm[4];
6'b000_101:Write_Seri<=Write_Comm[5];
6'b000_110:Write_Seri<=Write_Comm[6];
6'b000_111:Write_Seri<=Write_Comm[7];
6'b001_000:Write_Seri<=Write_Comm[8];
6'b001_001:Write_Seri<=Write_Comm[9];
6'b001_010:Write_Seri<=Write_Comm[10];
6'b001_011:Write_Seri<=Write_Comm[11];
6'b001_100:Write_Seri<=Write_Comm[12];
6'b001_101:Write_Seri<=Write_Comm[13];
6'b001_110:Write_Seri<=Write_Comm[14];
6'b001_111:Write_Seri<=Write_Comm[15];
6'b010_000:Write_Seri<=Write_Comm[16];
6'b010_001:Write_Seri<=Write_Comm[17];
6'b010_010:Write_Seri<=Write_Comm[18];
6'b010_011:Write_Seri<=Write_Comm[19];
6'b010_100:Write_Seri<=Write_Comm[20];
6'b010_101:Write_Seri<=Write_Comm[21];
6'b010_110:Write_Seri<=Write_Comm[22];
6'b010_111:Write_Seri<=Write_Comm[23];
6'b011_000:Write_Seri<=Write_Comm[24];
6'b011_001:Write_Seri<=Write_Comm[25];
6'b011_010:Write_Seri<=Write_Comm[26];
6'b011_011:Write_Seri<=Write_Comm[27];
6'b011_100:Write_Seri<=Write_Comm[28];
6'b011_101:Write_Seri<=Write_Comm[29];
6'b011_110:Write_Seri<=Write_Comm[30];
6'b011_111:Write_Seri<=Write_Comm[31];
default:Write_Seri<=1'b0;
endcase
assign SPI_MOSI =Write_Seri ;

复制代码

仿真波形如下图：

这段代码应该是综合成两个数据选择器，但为什么计数器计到128时(WRITE_Counter[10:7]变为001)，Write_Comm数值变化了，Write_Seri却没有做相应变化。求大家帮帮我。如何做到仿真与电路功能完全一致呢？

mudu86 · 发表于 2013-12-23 10:52:55

在第二个always中 Write_Comm是作为输入，是不是应该放入到always的敏感列表中呢

prototyping · 发表于 2013-12-23 11:30:54

回复 2# mudu86

恩应该都要放进去的

orlye · 发表于 2013-12-23 13:33:54

敏感列表没写全。
其实第二个case语句只要一句话assign Write_Seri=rite_comm[WRITE_Counter[6:1]]；就行了。

prototyping · 发表于 2013-12-23 22:21:30

回复 4# orlye

恩，综合出来的电路一样吗？

znn04006518 · 发表于 2013-12-24 16:33:11

敏感列表沒寫全，第一個和第二個always都是。

gygyg · 发表于 2013-12-24 16:55:29

最好还是加时钟，用时序逻辑吧

prototyping · 发表于 2013-12-24 17:15:44

回复 7# gygyg

为什么用时序逻辑？时序逻辑面积大，功耗高，速度慢啊！

orlye · 发表于 2013-12-24 19:46:22

回复 5# prototyping

当然一样

xaaa001 · 发表于 2013-12-25 03:58:31

回复 1# prototyping
comn 放到第2个always 敏感变量列表中

2001语法支持 always(*) 更方便

[求助] 综合后电路与前仿波形不一致的情况，请大家进来分析分析！

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